Now that everybody and their dog (literally, in the case of Petsmart) is issuing club-card tracking devices for frequent shoppers, wallets are in for a serious case of overload.
Choices at the checkstand aren't that great. Either you fumble through a stack of club cards to find the right one, or use keytabs and hand over your keyring for manhandling by germy-handed strangers.
Enter the bar-code card hack from Instructables. Scanning all club-card bar codes into Photoshop, you create and laminate a single source for club-card bar codes. Kill the keytabs and cut wallet clutter: